#!/usr/bin/perl -w
#
# food additives and their analogs available in chemistry commons
#
# how many compounds in additives. 
# how many are purchasable. 
# list compounds that are purchasable. 
# list compounds with purchasable analogs
# detail page for one purchasable molecule
# detail page for one unpurchasable molecule

# for each compounds.  exact purchasable ?  1 step,2 steps, 3step 4 steps.
# wq
#
# wq
# q
#